reason why we are closing these restaurants is really for them to be able to take the time to clean the environment. >> reporter: chef armando anauiz says in eight years no patron of his has ever been sickened. he says hand wash and existing workers stay home when they're sick is what helps them stay opened. >> things happen, there's germs around. but clean it up and get it reopened it's a good restaurant. >> reporter: health experts say the strain of noro virus circulating now is especially viralent. wash your hands with soap and water that hand sanitizers are not enough. health and science editor john fowler ktvu channel 2 news. >>> we got some showers showing up in southern california. our system has moved through for now. that system dropped a few light showers early this morning but now it's out of here. but behind it is a very chilly air. so the really big story tonight is how cold it's going to be tomorrow morning. if you're a golfer, possible delays. if you have a game, a sweater. napa 39, pacifica 34. very chilly morning for your saturday morning. it's going to be cooler on sunday morning.